Serial RFID Read/Write Module

$59.95 ea

  • Part no.: 2123514
  • Manufacturer: Parallax
  • Manufacturer no.: 28440
  • RoHS Compliant
# of units Price
1+ $59.95
5+ $53.95

Serial RFID Read/Write Module

Designed in cooperation with Grand Idea Studio, the Parallax Radio Frequency Identification (RFID) Read/Write Module provides a low-cost solution to read and write passive RFID transponder tags up to 3 inches away. The RFID transponder tags provide a unique serial number and can store up to 116 bytes of user data, which can be password protected to allow only authorized access.

The RFID Read/Write Module can be used in a wide variety of hobbyist and commercial applications, including access control, user identification, robotics navigation, inventory tracking, payment systems, car immobilization, and manufacturing automation.


  • Low-cost method for reading and writing passive, 125 kHz RFID transponder tags
  • Can write to Read/Write RFID Card (#28441)
  • Up to 116 bytes of user data storage on a single tag
  • Optional security features prevent tag from being read or written without password
  • Bi-color LED for visual indication of status

    Application Ideas

  • Personnel entry system
  • Keyless entry system
  • Equipment/package tracking


  • Voltage requirements: 5 VDC
  • Current requirements: < 10 mA idle, approx. 100-200 mA active
  • Communication: asynchronous serial 9600 bps, (8N1); 5 V TTL-level, non-inverted
  • Dimensions: 3.25 x 2.45 in (8.26 x 6.2 cm)
  • Operating temp range: +32°F to +158°F (0°C to +70°C)

    This product is included also available in some retail locations as RFID Read/Write with Tags (#28443-RT).

    Downloads & Resources

  • RFID Read/Write Module Documentation
  • RFID Read/Write Module BASIC Stamp Demo Code
  • RFID Read/Write Module Arduino Code Example

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